Electric elevator



l(No Model.)

N. 0. LINDSTROM ELECTRIC ELEVATOR. vNo. 544,768. yPatented A'ug WITNESSES;

UNITED-:STATES,rm-@NTo1-nca;

NILs o.` LINDs'm-ton, or UNION Counsel; -AssIGNoR- To THE A; B. SEE.MANUFACTURING COMPANY; on BRooKLvN, NEW YoRK.

' Epi-:orme

EnsvAToR,

SPEOIFICATQN forming partefLettersretentir@544,7e8dtedAugust.2O,1895

' ppncnon sied Mayjia, 1895.

.To alla/hom, it may-concern: f Beit known that I, NILs O; LINDSTROM', a

citizen ot theUnited'States, residing in Union Course,`in the county ofQueens 'and State of New York,` have invented certain new and usefulImprovements in ElectricI Elevatorsfot which the following is aspecification.' This invention relates to electrically-operatedelevators.v g 3 The vobjects of the invention are to'simplify theconstruction of the switching-apparatus, controlling the direction ofrotation -ot thel the motor, by which the field-magnet is nor-l mallykept charged ready for instant action and adapted to close thearmature-circuit on itself when the switch is shifted to a stoppingposition, thus causing the motor to act as a .magnetic brakeand smoothlyand powerfully reduce the speed of travel of the car. Thecontinuously-closed circuitwhich maintains the field-magnet charge alsoacts magnetically on the controller to hold it forcibly in a position inwhich the armat ure-'circuit is open Vuntil by a suitable change of thecar-switchit is permitted to change position and start u p the motor. fThe several features of .novelty ot' `the invention will behereinafter.more fully-de;

scribed andwill be deuitely indicated-'in the claims appended to vthisspecification(y In the accompanying drawing,`which diagrammatica-llyillustrates Athe inven'tiongis shown asystem embodying my improvements.Upon the elevator-car is a switch l, compris-A ing a pivotedmetallichand-leverl provided with three tro-operating contacts-f23:4;prefe'rably arranged Ain an arc of a'circle over which' the leversweeps.A The car is indicated in dotted lines and the hoisting-cable andits windv ing-drum-havebeen omitted for vcl ee'. rnessand simplicity. f

sannita. 549,492. momenti thejarmature is'closed on the `supplyci'rcuit. The contacts 2 3 4 of thecarswitchare insuswitch-lever isnorm'allyin the position shown in the drawing, bearingon the-contact 3,The

ply-circuit, are grou ped in acable follow the movements of the car.

mounted to slide in `tubularbearings `formedof non-magnetic' andpreferablynon-conductlenoid-cores when at eithenextremejot movement,

14 llarepresent solenoidsto control-{closswitch on one side, and withthe field-magnet cores 131'37',arecompoundin character,being adaptedtobe closed on lthelgarmatme-lofixlslies n 2Q 2O5arepivotedarmsjorlevers, which may he counterweighted, as shown, onsprlngoperationwiththe cores 1G3f'1 3]'7as, f orexainple, by beinglooselyl pivotedthereto, as shown. Each lever 'carries insulatedmetallic brushes -whe'n th motor is open-circuited, antithe-,lastv` Aset y'in series wiithfth'e m Ot0 1"when-operating.

yo l6,, the 'former of which '-is' always' incircu'it and the latter-ofvwhich is on'ly-incircuit when* 55 lated from' one another and soarrangedthat; 'the switch-lever 'inpassing from 3 to 2 or 4 will notbreak the vield-magne't circuit.' The 6o, lever is connected with oneside V'ot-a supplyfrom the car-switch tothe controlleriand supadapted to f 13 13a. represent solenoid-cores, each 'co-operating withsolenoid-coils bywhichr'theirt movement is controlled. As shown, the-'yarey ing material-such as wood, paper', or indu? rated ber-suitablysupported upon a frameg work or wall, The bearings are'p'rovidfedwith Yplugs of iron to produces. firmgriponthe soa y;.

vurefot the armature-circuit, and connecting with contacts 23nd 4,respectively, of the car-Vv 8o coil'5 'on the other side. 'The shell 15is prov vided at or nea-rits middle with a plug of iron, j

(indicated,) against which thecores 13-13jlfbear y when the Vmotorisrcut outotV circuit. f lhe. 8

5 magnetically insulatedat the ln liddle 4point by a section 31vv ljotbrass oi; other hon-m'ag- V notie materialgtofperniitthe' twqinonsections of eachv core to he. separate1y-vgagnetized. fj 1 'Around. `the shell is placedfthree coilsor actuated. These levers. are arranged,fforgcorco 21, 22, 23, ce. Brushes 21 21s @i5-operaie withcontact-strips 19, 24, 19, and 24. Contactstrips 24 24* are electricallyconnected with i thearmature-brushes, a suitable resistance 25 beinginterposed in.one branch. Brushes 22 and 23 co-operate with pairs ofcontact-strips 26 27, 28 29, one strip of each pairconnecting with therespective armature-brushes and the other with the respectivesupply-wires. The brushes 21, dro., and their cci-operating contacts aresimilarly arranged, except that strips 27 and 28 are rcversely connectedtothe armature-brushes compared with 27 28.

As thus organized, the operation of the apparatus is as follows: Thefield-magnet coils 5 5 and the solenoid-coils 16 16'* of the controllerare normally charged, current flowing from one direct-curentmain 7 overconductor 0, switch-lever, contact 3, conductor 1l, coils 16 16, andfield-magnet coils 5 5` to the opposite main 8. This results inseveralim' portant functions: First, it keeps the ileldmagnet chargedandyields a high-instantaneous counter-electromotive force in the motorwhen the armature is cut. into circuit; second, it permits the motor toactas a brake in stopping by reason ot the charged iield, and, third, itoperates the controller to out ol the lsupply of current from the mainsto the armature and positively holds the controller in such positionuntil the switch lever in the car is actuated. When the attendantdesires to start the car, he operates the handswitch so as to connectAwith contact 2 or 4, one of which determines ascending and the otherdescending motion. If contact 2 be energized, solenoid 14 is renderedactive, the in- .egrity'of the iield-magnet being constantly preserved.The solenoid draws in core 13 and ythrows the controller-switch,bringing brushes 22 23 into engagement with contactstrips 26 and 27 and28 29, respectively. Cnrrent is thereby thrown into the armature at itslower brush from main 7, contact-strips 29 28, armatnre-coils,.rheostat30, contact-strips 27 26, controller-coils 18 18, series field-magnetcoiltf to opposite main 8. The seriescoil 6 Ga'consists of a few turnsofcoarse wire i wound in a direction to increase the ction'of ,theshunt-coil 5 5 in producing a strong starting-torque. Ii an oppositedirection of cartravel be desired, contact 4 will be energized by thecar-attendant, thus energizing solenoid 14* of the controller andreversing the armature-circuit by cutting in contact-strips 26* 27,&c.,which lead current through the armature by way of its upper brush. Itwill be noted that when the motoris running in either direction-that isto say, when its armature l is drawingcurrentfrom themains-controllercoils 18 18* are energized and therefore lock the idleside of the controller. Thisconstruction also prevents a sudden reversalof the motor by a quick throw of the hand-switch by the car-attendant,for if said switch be quickly thrown from, say, contact2 to contact 4core` 13 cannot be shifted by its solenoid 14* until the motor hassmoothlystoppec, for after dea-energizing coil 14 core 13 is shifted byits counterweight and puts the motorarmature on closed circuit throughcontacts i `19 24 and coils 17 17, the motor then acting as a generator,and the latter coilsmagnetically lock core 13* until the car and themotor have stopped, when current ceases in the closed local circuit andcore 135` isfree to obey solenoid 14 and reverses the circuit by v ,downthe car.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. An electric elevator comprising a car, a driving electric motor, aswitch on 'the car forcontrolliug its direction of travel, and

meansfor placing the motor on closed circuit and maintaining itsfield-magnet charged aiter the switchhas been operated to cut it out ofcircuit.

2. An electric elevator comprising a car, a i

driving electric motor, a circuit-controller for reversing the motorcircuits, and a switch on the car and connections for normallymaintaining the' motor field-magnet charged.

, 3. An electrichelevator comprising a car, a driving electric motor,- amagnetically operated'circuit-controller for reversing the armaturecircuit, a switch on the car, connections i for maintaining the motorfield-magnet constantly charged, and a switch operated by the controllerfor placing the motor armature on closed circuit when the motor iscutout.

4. An electric elevator comprising a car, a driving electric motor, a.magnetically operated circuit-controller for reversing the motor, aswitch on the car for operating the controlle'r, and means formagnetically locking the controller against a sudden reversing movement.i -4 5. An electric elevator comprisinga car, a driving electric motor,two independently actuated circuit-cpntrolling switches, a switch on4the car for operating either circuit-controlling device, and means formagnetically locking one circuit-controlling device while the otherconnects the motor in circuit. v

6. An electric elevator comprising a car, a`

'coils for shifting4 the circuit-controller, each coil being in serieswith the field-magnet, and

-a car-switch normally completing the fieldmagnet circuit and adapted tocut inl either controller-coil.

7. An electric elevator comprising a car, n

driving electric motor, a circuit-controller atI or near the motor,solenoids 14, 14, acarswitch for cutting in either solenoid, and lockingcoils`18, 18.*in circuit when the'motor is operating, cooperating withthe solenoid cores when in their normal position.

. 8.- An electric Aelevator comprising 'a car, a driving electricmotor,a circnit-controlir at 1 out and cooperating with the solenoid cores lofwhenvvin' their normal position. n i

l y' .9.; An .electric elevator comprising a car, a driving electricmotor," 'avn'orniallycharged ieldfmagnet coiland an' auxiliary Iield-m'ag`- net coih wound toas'sist .the main -coil, said auxiliarycoil being 'out into circuit lwhen the motor starts into operation A 10.An electric' elevator comprising a car, a

' `driving electric tnotor, a circuit-controller at or near the motor,solenoids 14, 14, controllerswitches operated by the cores of theselenoids,a retractile agency to normally hold thel switches open, andauxiliary coils `for magnetically locking either of the solenoid cores.or. near the. "motor, solenoids 14, .142e carswitch for cutting in.either solenoid, locking.4 coils`17, 17a in circui\`.-,whenftheV motoris cut 11. A controller comprising two compound cores 13,13a havingtheirmernbers magnetica117 insulated from each other, solenoid coils 14,14:a cooperatingv with onev member, and auxiliary solenoids cooperatingwith the other member. i l

In testimonywhereof I have hereunto subk 3o scribed my name this 10thday of May, A; D, 1895.

' NILS O. LINDSTROM.

Witnesses:

D. A. MASON, PHILIP KOMPFF, Jr.

